OK, unless I'm much mistaken, I believe most of the older cues ('72, '74, '76, '83, '94) were still in use throughout Season 36. When did they pretty much disappear (well, barring the one-offs like the disco party show, Decades Week, etc.)?

A lot of the older cues survived well into 37 and still quite a few were in use by 38, if I'm not mistaken. In S39, when I started watching regularly again, they still pulled out 200A for Race Game/Take Two, and a few times PHG for More or Less. MGHS was probably the longest surviving one. I forgot when it stopped being used, but it was fairly semi-regular through 40 and 41.

Me: Of all of the game shows you've hosted, besides Jeopardy!, like High Rollers or Classic Concentration, which is your favorite?Alex Trebek: I'd have to say To Tell The Truth, because it was the first time in my career that I got sit down while I was hosting.